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Date: Wed, 4 Nov 2009 15:25:16 GMT
From: tip-bot for Masami Hiramatsu <mhiramat@...hat.com>
To: linux-tip-commits@...r.kernel.org
Cc: mingo@...hat.com, peterz@...radead.org, fweisbec@...il.com,
rostedt@...dmis.org, jbaron@...hat.com, tglx@...utronix.de,
mhiramat@...hat.com, hpa@...or.com, fche@...hat.com,
linux-kernel@...r.kernel.org, jkenisto@...ibm.com,
hch@...radead.org, ananth@...ibm.com, srikar@...ux.vnet.ibm.com,
prasad@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perf/probes] perf/probes: Fall back to non-dwarf if possible
Commit-ID: a225a1d911f0e434dc0407df29fd08e4388f3fa4
Gitweb: http://git.kernel.org/tip/a225a1d911f0e434dc0407df29fd08e4388f3fa4
Author: Masami Hiramatsu <mhiramat@...hat.com>
AuthorDate: Tue, 3 Nov 2009 19:12:30 -0500
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 4 Nov 2009 13:02:47 +0100
perf/probes: Fall back to non-dwarf if possible
Fall back to non-dwarf probe point if the probe definition may
not need dwarf analysis, when perf can't find vmlinux/debuginfo.
This might skip some inlined code of target function.
Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Jim Keniston <jkenisto@...ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Frank Ch. Eigler <fche@...hat.com>
Cc: Jason Baron <jbaron@...hat.com>
Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
LKML-Reference: <20091104001229.3454.63987.stgit@...usame>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
tools/perf/builtin-probe.c | 64 ++++++++++++++++++++++-----------------
tools/perf/util/probe-finder.c | 6 ++-
2 files changed, 40 insertions(+), 30 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 65bcaed..d111a93 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -189,7 +189,7 @@ static void parse_probe_event(const char *str)
/* Parse probe point */
parse_probe_point(argv[0], pp);
free(argv[0]);
- if (pp->file)
+ if (pp->file || pp->line)
session.need_dwarf = 1;
/* Copy arguments */
@@ -347,36 +347,24 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
if (session.nr_probe == 0)
usage_with_options(probe_usage, options);
-#ifdef NO_LIBDWARF
if (session.need_dwarf)
- semantic_error("Dwarf-analysis is not supported");
-#endif
-
- /* Synthesize probes without dwarf */
- for (j = 0; j < session.nr_probe; j++) {
-#ifndef NO_LIBDWARF
- if (!session.probes[j].retprobe) {
- session.need_dwarf = 1;
- continue;
- }
-#endif
- ret = synthesize_probe_event(&session.probes[j]);
- if (ret == -E2BIG)
- semantic_error("probe point is too long.");
- else if (ret < 0)
- die("Failed to synthesize a probe point.");
- }
-
-#ifndef NO_LIBDWARF
- if (!session.need_dwarf)
- goto setup_probes;
+#ifdef NO_LIBDWARF
+ semantic_error("Debuginfo-analysis is not supported");
+#else /* !NO_LIBDWARF */
+ pr_info("Some probes require debuginfo.\n");
if (session.vmlinux)
fd = open(session.vmlinux, O_RDONLY);
else
fd = open_default_vmlinux();
- if (fd < 0)
- die("Could not open vmlinux/module file.");
+ if (fd < 0) {
+ if (session.need_dwarf)
+ die("Could not open vmlinux/module file.");
+
+ pr_warning("Could not open vmlinux/module file."
+ " Try to use symbols.\n");
+ goto end_dwarf;
+ }
/* Searching probe points */
for (j = 0; j < session.nr_probe; j++) {
@@ -386,14 +374,34 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
lseek(fd, SEEK_SET, 0);
ret = find_probepoint(fd, pp);
- if (ret <= 0)
- die("No probe point found.\n");
+ if (ret < 0) {
+ if (session.need_dwarf)
+ die("Could not analyze debuginfo.");
+
+ pr_warning("An error occurred in debuginfo analysis. Try to use symbols.\n");
+ break;
+ }
+ if (ret == 0) /* No error but failed to find probe point. */
+ die("No probe point found.");
}
close(fd);
-setup_probes:
+end_dwarf:
#endif /* !NO_LIBDWARF */
+ /* Synthesize probes without dwarf */
+ for (j = 0; j < session.nr_probe; j++) {
+ pp = &session.probes[j];
+ if (pp->found) /* This probe is already found. */
+ continue;
+
+ ret = synthesize_probe_event(pp);
+ if (ret == -E2BIG)
+ semantic_error("probe point is too long.");
+ else if (ret < 0)
+ die("Failed to synthesize a probe point.");
+ }
+
/* Settng up probe points */
snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
fd = open(buf, O_WRONLY, O_APPEND);
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 35d5a69..293cdfc 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -687,8 +687,10 @@ int find_probepoint(int fd, struct probe_point *pp)
struct probe_finder pf = {.pp = pp};
ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
- if (ret != DW_DLV_OK)
- die("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO.\n");
+ if (ret != DW_DLV_OK) {
+ pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO.\n");
+ return -ENOENT;
+ }
pp->found = 0;
while (++cu_number) {
--
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